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(a) With brake pedal released, there should be continuity: • Between pin 1 and pin 4 • Between pin 3 and pin 6 • No continuity between pin 2 and pin 5 (b) With brake pedal depressed, there should be no continuity: • Between pin 1 and pin 4 • Between pin 3 and pin 6 • Continuity between pin 2 and pin 5 (2) If the above results are not obtained, the stop lamp switch is defective or out of adjustment. (3) Stop lamp switch adjustment is detailed in Group 5, Brakes. VACUUM SUPPLY TEST (1) Disconnect vacuum hose at the servo and in- stall a vacuum gauge in the hose (Fig. 17). (2) Start engine and observe gauge at idle. Vac- uum gauge should read at least ten inches of mer- (3) If vacuum does not meet this requirement, check and correct the following vacuum leaks: • Check valve • Vacuum reservoir • Servo, refer to Servo Vacuum Test • Poor engine performance SERVO VACUUM TEST (1) Remove the vehicle speed control cable at the throttle body end. (2) Disconnect the 4-way electrical connector and the vacuum harness at the servo (Refer to Fig. 12). (3) Connect battery voltage to pin 2 of the servo. 4. (5) Connect a hand held vacuum pump to the servo vacuum nipple and apply 10 to 15 inches of vacuum. (6) The cable should pull in and hold for as long as vacuum is applied. SERVO UNIT REMOVAL (1) Remove two nuts attaching vehicle speed con- trol cable and mounting bracket to servo. (2) Remove screws attaching servo mounting bracket. (3) Remove servo mounting bracket. Fig. 15 Vehicle Speed Control Switch Continuity Fig. 16 Stop Lamp and Vehicle Speed Control Switch Wiring Fig. 17 Vacuum Gauge Test Ä VEHICLE SPEED CONTROL 8H - 9 |